WO2020220304A1

WO2020220304A1 - Device for fingerprint recognition and electronic device

Info

Publication number: WO2020220304A1
Application number: PCT/CN2019/085291
Authority: WO
Inventors: 曾媛媛
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-11-05
Also published as: CN212749851U; CN110799988B; CN110799988A

Abstract

A device for fingerprint recognition and an electronic device. The device for fingerprint recognition is applicable in the electronic device provided with a flexible display screen and is capable implementing in-display fingerprint recognition of the flexible display screen. The device comprises: a support structure, used for being at least partly provided in a transparent area under the flexible display screen, the support structure being used for supporting the flexible display screen; and an optical fingerprint module, used for being provided on the support structure, the optical fingerprint module being used for collecting an optical signal reflected or scattered by a finger on the flexible display screen and transmitted from the transparent area.

Description

Fingerprint recognition device and electronic equipment

Technical field

The embodiments of the present application relate to the field of biometric identification, and more specifically, to a fingerprint identification device and electronic equipment.

Background technique

The fingerprint recognition technology under the optical screen uses the optical fingerprint module to collect the light emitted by the light source and reflect the reflected light on the finger above the display screen. The reflected light carries the fingerprint information of the finger to realize the fingerprint recognition under the screen. For electronic devices with flexible displays, when a finger is pressed on the flexible display for fingerprint recognition, because the material of the flexible display is soft, deformation may occur in the finger pressing area, which not only affects the user experience, but also affects the optical fingerprint model. The fingerprint recognition performance of the group may even cause damage to the flexible display and optical fingerprint module.

Summary of the invention

The embodiments of the present application provide a fingerprint identification device and electronic equipment, which can realize under-screen fingerprint identification of a flexible display screen.

In the first aspect, a fingerprint identification device is provided, which is applied to an electronic device with a flexible display screen, and the device includes:

A supporting structure, configured to be at least partially disposed in a light-transmitting area below the flexible display screen, and the supporting structure is used to support the flexible display screen;

The optical fingerprint module is used to be arranged on the supporting structure, and the optical fingerprint module is used to collect the light signal reflected or scattered by the finger above the flexible display screen and transmitted from the light-transmitting area.

In a possible implementation, the supporting structure is a boss structure, and the boss of the boss structure is located in the light-transmitting area.

In a possible implementation manner, the protrusion is located under the foam layer of the flexible display screen.

In a possible implementation manner, the edge of the protrusion and the foam layer of the flexible display screen are connected by foam or glue film.

In a possible implementation manner, the non-protruding portion of the boss structure is located below the middle frame of the electronic device.

In a possible implementation manner, the upper surface of the non-protruding portion is stuck to the lower surface of the middle frame by glue or film.

In a possible implementation, a metal sheet is provided between the flexible display screen and the middle frame of the electronic device, and a light-transmitting window is provided on the metal sheet, and the light-transmitting window is located in the In the light-transmitting area, the non-protruding portion is located below the metal sheet.

In a possible implementation manner, the upper surface of the non-protruding portion is pasted to the lower surface of the metal sheet by glue or film.

In a possible implementation manner, the protruding part is formed of cured glue, and the non-protruding part is a transparent flat plate pasted under the protruding part.

In a possible implementation manner, the protrusion is formed by filling the glue before curing into the transparent window of the metal sheet and curing it.

In a possible implementation manner, the height of the upper surface of the protrusion is the same as the height of the upper surface of the metal sheet.

In a possible implementation manner, the convex portion and the upper surface of the metal sheet are covered with an overflow glue layer formed by the glue overflowing the transparent window of the metal sheet before curing.

In a possible implementation manner, the glue is ultraviolet curing UV glue.

In a possible implementation manner, the boss structure is integrally made of a transparent material.

In a possible implementation manner, the transparent material is transparent glass or resin.

In a possible implementation, there is a spacer layer between the flexible display screen and the supporting structure.

In a possible implementation manner, the spacer layer is an air spacer layer.

In a possible implementation manner, at least one through hole is provided on the spacer layer, and the at least one through hole is used to transmit the optical signal.

In a possible implementation manner, the spacer layer is a foam layer or a metal layer.

In a possible implementation manner, a plurality of through holes are provided on the supporting structure, and the plurality of through holes are used to transmit the optical signal.

In a possible implementation, the support structure is a foam layer or a metal layer.

In a possible implementation manner, the device further includes: a buffer layer, which is arranged between the flexible display screen and the support structure.

In a possible implementation manner, the buffer layer is fixed on the lower surface of the flexible display screen.

In a possible implementation manner, the spacer layer is located between the buffer layer and the support structure.

In a possible implementation manner, the buffer layer is fixed on the upper surface of the support structure.

In a possible implementation manner, the spacer layer is located between the buffer layer and the flexible display screen.

In a possible implementation manner, the upper surface of the buffer layer is glued to the lower surface of the flexible display screen, and the lower surface of the buffer layer is glued to the upper surface of the protrusion of the boss structure.

In a possible implementation, the buffer layer includes one or more transparent film materials.

In a possible implementation manner, the optical fingerprint module is fixed on the lower surface of the supporting structure.

In a second aspect, a method for manufacturing a support structure is provided, the support structure is used to support a flexible display screen of an electronic device, the support structure is a boss structure, and the method includes:

Placing the metal sheet used for setting under the flexible display screen horizontally on one side of the auxiliary flat plate, wherein the auxiliary flat plate covers the light-transmitting window of the metal sheet;

Pour liquid glue into the part of the auxiliary plate located in the light-transmitting window;

Covering the transparent flat plate onto the light-transmitting window from the other side of the auxiliary flat plate, so that the glue in a liquid state fills the light-transmitting window;

The glue in the liquid state is cured to obtain the boss structure, wherein the convex part of the boss structure is the glue after curing, and the non-convex part of the boss structure is the transparent flat.

In a possible implementation manner, the glue is a curing glue, such as a thermosetting glue or a UV glue.

In a possible implementation manner, the transparent plate is made of transparent glass or transparent resin.

In a second aspect, a terminal device is provided, including:

Flexible display screen; and, the fingerprint recognition device in the first aspect or any possible implementation of the first aspect.

In a possible implementation manner, the electronic device further includes a middle frame.

In a possible implementation manner, a metal sheet is arranged between the flexible display screen and the middle frame.

Based on the above technical solution, by providing a support structure in the light-transmitting area under the flexible display screen, the support structure can provide support for the flexible display screen, reduce the deformation caused by the finger pressing the flexible display screen during the fingerprint recognition process, and avoid damage to the flexible display screen. Damage to the display. Moreover, since the optical fingerprint module is arranged on the supporting structure, the distance between the optical fingerprint module and the flexible display screen can be flexibly adjusted through the supporting structure, thereby improving the performance of fingerprint recognition. In addition, since the optical fingerprint module and the flexible display screen have been decoupled, it is convenient to disassemble and install the optical fingerprint module, and facilitate the maintenance of the optical fingerprint module.

Description of the drawings

Fig. 1 is a schematic diagram of the structure of an electronic device to which this application can be applied.

Fig. 2 is a schematic cross-sectional view of the electronic device shown in Fig. 1 along the A-A' direction.

Fig. 3 is a schematic block diagram of a fingerprint recognition device according to an embodiment of the present application.

FIG. 4 is a schematic diagram of a possible structure of the fingerprint identification device in an embodiment of the present application.

FIG. 5 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

Fig. 6 is a schematic diagram of various components of the fingerprint recognition device in Fig. 5.

FIG. 7 is a schematic diagram of a possible structure of the fingerprint identification device of the embodiment of the present application.

8(a) to 8(c) are schematic diagrams of the buffer layer of the embodiment of the present application.

FIG. 9 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

FIG. 10 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

FIG. 11 is a schematic flowchart of a manufacturing method of a support structure according to an embodiment of the present application.

Fig. 12 is a plan view of a metal sheet according to an embodiment of the present application.

FIG. 13 is a schematic diagram of a boss structure used in the method shown in FIG. 11.

Fig. 14 is a schematic diagram of a boss structure manufactured based on the method shown in Fig. 11.

Figure 15 is a schematic diagram of the overflow adhesive layer.

FIG. 16 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

FIG. 17 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

FIG. 18 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings.

It should be understood that the embodiments of this application can be applied to optical fingerprint systems, including but not limited to optical fingerprint identification systems and medical diagnostic products based on optical fingerprint imaging. The embodiments of this application only take optical fingerprint systems as an example for description, but should not The embodiments of the application constitute any limitation, and the embodiments of the present application are also applicable to other systems using optical imaging technology.

As a common application scenario, the optical fingerprint system provided in the embodiments of this application can be applied to smart phones, tablet computers, and other mobile terminals with display screens or other terminal devices; more specifically, in the above-mentioned terminal devices, the optical fingerprint The module may be specifically an optical fingerprint module, which may be arranged in a partial area or the entire area below the display screen to form an under-display or under-screen optical fingerprint system. Alternatively, the optical fingerprint module can also be partially or fully integrated into the display screen of the terminal device to form an in-display or in-screen optical fingerprint system.

Figures 1 and 2 show schematic diagrams of electronic devices to which the embodiments of the present application can be applied. 1 is a schematic diagram of the electronic device 10, and FIG. 2 is a schematic partial cross-sectional view of the electronic device 10 shown in FIG. 1 along the A-A' direction.

The terminal device 10 includes a display screen 120 and an optical fingerprint module 130. Wherein, the optical fingerprint module 130 is arranged in a partial area below the display screen 120. The optical fingerprint module 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131. The area where the sensing array 133 is located or its sensing area is the fingerprint detection area 121 of the optical fingerprint module 130 (also referred to as a fingerprint collection area, a fingerprint recognition area, etc.). As shown in FIG. 1, the fingerprint detection area 121 is located in the display area of the display screen 120. In an alternative embodiment, the optical fingerprint module 130 may also be arranged in other positions, such as the side of the display screen 120 or the non-transparent area of the edge of the terminal device 10, and the optical fingerprint module 130 The optical signal of at least part of the display area of the display screen 120 is guided to the optical fingerprint module 130 so that the fingerprint detection area 121 is actually located in the display area of the display screen 120.

It should be understood that the area of the fingerprint detection area 121 may be different from the area of the sensing array 133 of the optical fingerprint module 130, for example, through an optical path design such as lens imaging, a reflective folding optical path design, or other optical paths such as light convergence or reflection. The design can make the area of the fingerprint detection area 121 of the optical fingerprint module 130 larger than the area of the sensing array 133 of the optical fingerprint module 130. In other alternative implementations, if for example, light collimation is used for light path guidance, the fingerprint detection area 121 of the optical fingerprint module 130 may also be designed to be substantially the same as the area of the sensing array of the optical fingerprint module 130.

Therefore, when the user needs to unlock the terminal device or perform other fingerprint verification, he only needs to press his finger on the fingerprint detection area 121 of the display screen 120 to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the terminal device 10 adopting the above structure does not need to reserve a space on the front side for the fingerprint button (such as the Home button), so that a full screen solution can be adopted, that is, the display area of the display screen 120 It can be basically extended to the front of the entire terminal device 10.

As an optional implementation manner, as shown in FIG. 1, the optical fingerprint module 130 includes a light detecting part 134 and an optical component 132. The light detection part 134 includes the sensor array 133, a reading circuit electrically connected to the sensor array 133, and other auxiliary circuits, which can be fabricated on a chip (Die) by a semiconductor process, such as an optical imaging chip Or an optical fingerprint sensor. The sensing array 133 is specifically a photodetector (Photodetector) array, which includes a plurality of photodetectors distributed in an array, and the photodetectors can be used as the aforementioned optical sensing unit. The optical component 132 may be disposed above the sensing array 133 of the light detecting part 134, and it may specifically include a filter layer (Filter), a light guide layer or a light path guiding structure, and other optical elements. The filter layer It can be used to filter out ambient light penetrating the finger, and the light guide layer or light path guiding structure is mainly used to guide the reflected light reflected from the surface of the finger to the sensor array 133 for optical detection.

In terms of specific implementation, the optical assembly 132 and the light detecting part 134 may be packaged in the same optical fingerprint component. For example, the optical component 132 and the optical detection part 134 can be packaged in the same optical fingerprint chip, or the optical component 132 can be arranged outside the chip where the optical detection part 134 is located, for example, the optical component 132 is attached above the chip, or some components of the optical assembly 132 are integrated into the chip.

Wherein, the light guide layer or light path guiding structure of the optical component 132 has multiple implementation schemes. For example, the light guide layer may specifically be a collimator layer made on a semiconductor silicon wafer, which has multiple A collimating unit or a micro-hole array. The collimating unit can be specifically a small hole. Among the reflected light reflected from the finger, the light that is perpendicularly incident on the collimating unit can pass through and be passed by the optical sensing unit below it. The light with an excessively large incident angle is attenuated by multiple reflections inside the collimating unit. Therefore, each optical sensing unit can basically only receive the reflected light reflected by the fingerprint pattern directly above it. The sensing array 133 can detect the fingerprint image of the finger.

In another embodiment, the light guide layer or the light path guide structure may also be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more aspheric lenses, which The sensing array 133 of the light detecting part 134 is used to converge the reflected light reflected from the finger to the sensing array 133 of the light detection part 134 below, so that the sensing array 133 can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger. Optionally, the optical lens layer may further have a pinhole formed in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to expand the field of view of the optical fingerprint module 130 to improve The fingerprint imaging effect of the optical fingerprint module 130 is described.

In other embodiments, the light guide layer or the light path guide structure may also specifically adopt a micro-lens (Micro-Lens) layer. The micro-lens layer has a micro-lens array formed by a plurality of micro-lenses, which can be grown by semiconductors. A process or other processes are formed above the sensing array 133 of the light detecting part 134, and each microlens may correspond to one of the sensing units of the sensing array 133, respectively. In addition, other optical film layers may be formed between the microlens layer and the sensing unit, such as a dielectric layer or a passivation layer. More specifically, between the microlens layer and the sensing unit, a light blocking layer (or called a light shielding layer) with microholes may also be included, wherein the microholes are formed between the corresponding microlens and the sensing unit. In between, the light blocking layer can block the optical interference between the adjacent microlens and the sensing unit, and make the light corresponding to the sensing unit converge into the microhole through the microlens and pass through the microhole. It is transmitted to the sensing unit for optical fingerprint imaging.

It should be understood that the above-mentioned several implementation schemes of the light guide layer or light path guide structure can be used alone or in combination. For example, a micro lens layer may be further provided above or below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the micro lens layer, its specific laminated structure or optical path may need to be adjusted according to actual needs.

As an optional implementation manner, the display screen 120 may be a display screen with a self-luminous display unit, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display or a micro-LED (Micro-LED) display Screen. Taking an OLED display screen as an example, the optical fingerprint module 130 may use the display unit (ie, an OLED light source) of the OLED display screen 120 located in the fingerprint detection area 121 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed on the fingerprint detection area 121, the display screen 120 emits a beam of light 111 to the target finger 140 above the fingerprint detection area 121. The light 111 is reflected on the surface of the finger 140 to form reflected light or pass through all the fingers. The finger 140 scatters to form scattered light. In related patent applications, for ease of description, the above-mentioned reflected light and scattered light are collectively referred to as reflected light. Because the ridge 141 and valley 142 of the fingerprint have different light reflection capabilities, the reflected light 151 from the fingerprint ridge and the reflected light 152 from the fingerprint valley have different light intensities, and the reflected light passes through the optical component 132. After that, it is received by the sensor array 133 in the optical fingerprint module 130 and converted into a corresponding electrical signal, that is, a fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby The terminal device 10 realizes the optical fingerprint recognition function.

In other embodiments, the optical fingerprint module 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection. In this case, the optical fingerprint module 130 may be suitable for non-self-luminous display screens, such as liquid crystal display screens or other passively-luminous display screens. Taking a liquid crystal display with a backlight module and a liquid crystal panel as an example, in order to support the under-screen fingerprint detection of the liquid crystal display, the optical fingerprint system of the terminal device 10 may also include an excitation light source for optical fingerprint detection. The excitation light source may specifically be an infrared light source or a light source of invisible light of a specific wavelength, which may be arranged under the backlight module of the liquid crystal display or arranged in the edge area under the protective cover of the terminal device 10, and the The optical fingerprint module 130 may be arranged under the edge area of the liquid crystal panel or the protective cover and guided by the light path so that the fingerprint detection light can reach the optical fingerprint module 130; or, the optical fingerprint module 130 may also be arranged at all Below the backlight module, and the backlight module is designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical Fingerprint module 130. When the optical fingerprint module 130 uses a built-in light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is the same as that described above.

It should be understood that, in specific implementation, the terminal device 10 further includes a transparent protective cover, and the cover may be a glass cover or a sapphire cover, which is located above the display screen 120 and covers the terminal. The front of the device 10. Therefore, in the embodiments of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate.

On the other hand, in some embodiments, the optical fingerprint module 130 may include only one optical fingerprint sensor. At this time, the fingerprint detection area 121 of the optical fingerprint module 130 has a small area and a fixed position, so the user is performing During fingerprint input, it is necessary to press the finger to a specific position of the fingerprint detection area 121, otherwise the optical fingerprint module 130 may not be able to collect fingerprint images, resulting in poor user experience. In other alternative embodiments, the optical fingerprint module 130 may specifically include multiple optical fingerprint sensors. The multiple optical fingerprint sensors may be arranged side by side under the display screen 120 in a splicing manner, and the sensing areas of the multiple optical fingerprint sensors collectively constitute the fingerprint detection area 121 of the optical fingerprint module 130. In other words, the fingerprint detection area 121 of the optical fingerprint module 130 may include multiple sub-areas, and each sub-area corresponds to the sensing area of one of the optical fingerprint sensors, so that the fingerprint detection area of the optical fingerprint module 130 121 can be extended to the main area of the lower half of the display screen, that is, to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 121 can also be extended to half of the display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.

In the embodiment of the present application, the display screen 120 may be a flexible display screen or a folding display screen. For example, the display screen 120 may be made of flexible materials such as plastic or metal.

The display screen 120 shown in FIG. 1 is an outward-turning folding display screen, and the display area of the display screen 120 is outside the display screen 120. However, the embodiment of the present application is also applicable to an inverted folding display screen. In this case, the display area of the display screen 120 may be inside the display screen 120.

When the display screen 120 is a flexible display screen, the transparent protective cover above it can be a flexible cover for protecting the display screen 120. The material of the flexible cover plate may be, for example, a flexible material such as polyimide resin film (Polyimide Film, PI). The flexible cover cannot provide support for the display screen 120. In this case, when the user presses the display screen 120, since the material of the display screen 120 is relatively soft, the part of the display screen 120 in the pressing area will be deformed, which not only affects the user experience , It may also affect the fingerprint recognition performance of the optical fingerprint module, and may even cause damage to the flexible display 120 and the optical fingerprint module.

In view of this, an embodiment of the present application proposes a fingerprint identification device, which can realize under-screen fingerprint identification of a flexible display screen.

FIG. 3 is a schematic diagram of a fingerprint identification device 300 according to an embodiment of the present application. The fingerprint recognition device 300 is applied to an electronic device with a flexible display 310. The fingerprint recognition device 300 includes a supporting structure 320 and an optical fingerprint module 330.

The supporting structure 320 is configured to be at least partially disposed in the light-transmitting area under the flexible display screen 310, and the supporting structure 320 is configured to support the flexible display screen 310.

The optical fingerprint module 330 is used to be arranged on the support structure 320, and the optical fingerprint module 330 is used to collect light reflected or scattered by the finger above the flexible display 310 and transmitted from the light-transmitting area signal.

The light-transmitting area can be understood as an area used to transmit light signals for fingerprint recognition, that is, the area through which light passes during the fingerprint recognition process.

Since the support structure 320 is provided between the flexible display 310 and the optical fingerprint module 330, during fingerprint recognition, the part of the flexible display 310 in the finger pressing area will be supported by the support structure 320 without serious problems. Deformation improves the user experience and avoids the impact on the fingerprint recognition performance of the optical fingerprint module 330.

The flexible display screen 310 may be, for example, a flexible LCD display screen or a flexible OLED display screen. The light-emitting layer of the flexible OLED display screen may include a plurality of organic light-emitting diode light sources, and the optical fingerprint module 330 may use at least part of the organic light-emitting diode light sources as excitation light sources for fingerprint recognition.

The flexible display screen 310 may correspond to the display screen 120 shown in FIGS. 1 and 2. For example, the flexible display 310 may include at least one of the following: flexible cover glass, touch control layer, polarizer, OLED light-emitting layer, foam layer, display light-shielding and heat-dissipating buffer layer, metal layer, various adhesive layers such as OCA Or PET etc. For related descriptions, reference may be made to the foregoing descriptions on the display screen 120, which is not repeated here for brevity.

The optical fingerprint module 330 may correspond to the optical fingerprint module 130 in FIGS. 1 and 2. The optical fingerprint module 330 may include an optical component and an optical fingerprint sensor. Wherein, the optical component is used to guide the optical signal to the optical fingerprint sensor, and the optical fingerprint sensor is used to obtain fingerprint information of the finger according to the collected optical signal.

The optical components include optical filters, optical path modulators and other optical components. Wherein, the optical path modulator may be composed of a collimating hole array, or at least one lens, or a micro lens array, for example. In addition, the optical fingerprint module 330 may also include a flexible circuit board and the like.

The fingerprint detection area of the optical fingerprint module 330 is at least partially located in the display area of the flexible display screen 310, and a light-transmitting area below the fingerprint detection area is used for light transmission. Wherein, the light signal reflected or scattered by the finger on the fingerprint detection area reaches the optical fingerprint module 330 through the transparent area. The optical fingerprint module 330 performs fingerprint identification according to the collected optical signal. The supporting structure 320 may specifically be used to support the part of the flexible display screen 310 in the fingerprint detection area, so as to prevent the part of the flexible display screen 310 in the fingerprint detection area from sinking. In other words, the supporting structure 320 is used to support the part of the flexible display screen 310 located above the light-transmitting area.

For the related description of the optical fingerprint module 330, please refer to the description of the optical fingerprint module 130 in FIG. 1 and FIG. 2. For the sake of brevity, it will not be repeated here.

The optical fingerprint module 330 can be pasted on the lower surface of the support structure 320 by materials such as glue or film. For example, the optical fingerprint module 330 includes an optical path modulator composed of an array of collimating holes; the optical fingerprint module 330 can also pass fingerprints. The module holder is fixed on the lower surface of the supporting structure 320. For example, the optical fingerprint module 330 includes an optical path modulator composed of lenses or microlenses. In addition, the optical fingerprint module 330 may also be fixed on the supporting structure 320 in other ways, such as mechanical fixing such as screw fixing, which is not limited in this application.

Alternatively, the optical fingerprint module 330 can also be fixed on the middle frame. For example, the edge of the optical fingerprint module 330 is pasted on the bottom surface of the middle frame, or the optical fingerprint module 330 is pasted on the bottom surface of the middle frame through its circuit board, or the edge of the transparent window of the middle frame 340 is provided with steps and optically The fingerprint module 330 is fixed on the step structure on the lower surface of the middle frame.

Generally, the middle frame 340 of the electronic device can be used to support the flexible display 310 and fix other components. The middle frame 340 has a light-transmitting window located below the fingerprint detection area, so that the light signal reflected or scattered by the finger above the fingerprint detection area can be transmitted to the optical fingerprint module 330 through the light-transmitting window.

Since the middle frame 340 is also provided with various holes and slots for fixing other structures and components, the middle frame 340 cannot provide the entire screen support for the flexible display screen 310.

At this time, a metal sheet 370, such as a steel sheet, may be provided between the middle frame 340 of the electronic device and the flexible display 310. Wherein, the metal sheet 370 is provided with a light-transmitting window, the light-transmitting window is located below the fingerprint detection area, and is used to transmit the light signal reflected or scattered by the finger above the fingerprint detection area, so that the light signal can reach the optical fingerprint model. Group 330.

Therefore, the supporting structure 320 can be used to support the part of the flexible display screen 310 that is located in the fingerprint detection area, and the metal sheet 370 can be used to support the part of the flexible display screen 310 that is located outside the fingerprint detection area, so as to realize the flexible display The entire screen support of the screen 310.

The embodiment of the present application does not limit the thickness of the metal sheet 370, for example, it may be 0-300 microns, or 50-200 microns.

The metal sheet 370 can be fabricated with the flexible display 310 to be a part of the flexible display 310; it can also be fabricated with the middle frame 340 to be a part of the middle frame 340, or as a part of the flexible display 310 and the middle frame. The independent components of the frame 340 are installed between the flexible display 310 and the middle frame 340.

Assuming that the fingerprint recognition device 300 is not provided with a supporting structure 320, for example, as shown in FIG. 4, FIG. 4 shows a flexible display screen 310, an optical fingerprint module 330 and a middle frame 340. The foam layer 311 of the flexible display 310 and the middle frame 340 are connected by a foam layer 341. The optical fingerprint module 330 and the middle frame 340 are connected by a foam layer 331. Among them, the foam layer 341 and the foam layer 331 can also be replaced with other adhesive materials such as adhesive film and glue.

The foam layer in the embodiments of the present application can be considered to include foam and back glue on the upper and lower surfaces of the foam, so it can also be called foam glue. The foam layer can play the role of adhesion and cushioning.

The light-transmitting window of the foam layer 311 and the light-transmitting window of the middle frame 340 shown in FIG. 4 form the aforementioned light-transmitting area for transmitting optical signals. The optical fingerprint module 330 is located under the transparent area. The light signal reflected or scattered by the finger on the fingerprint detection area 312 is transmitted to the optical fingerprint module 330 through the light-transmitting area, and the optical fingerprint module 330 performs fingerprint identification according to the collected light signal.

Due to the soft material of the flexible display screen 310, an obvious step area is formed at the fingerprint detection area 312 in the flexible display screen 310. This stepped area not only reduces the user experience, but may also damage the flexible display 310 due to finger pressing, and affect the fingerprint recognition performance of the optical fingerprint module 330.

In order to support the flexible display screen 310, in the embodiment of the present application, a support structure 320 is provided in the light-transmitting area under the flexible display screen 310 to support the step area.

The supporting structure 320 should have a certain degree of hardness. At the same time, the supporting structure 320 should be able to transmit optical signals so that the optical signals reflected or scattered by the finger can be transmitted to the optical fingerprint module 330.

Therefore, the support structure 320 may be transparent. For example, the support structure 320 may be made of a transparent material such as optical glass or optical resin. Alternatively, multiple through holes may be provided on the support structure 320, and the multiple through holes are used to transmit optical signals.

Optionally, the flexible display screen 310 and the support structure 320 may be closely attached to each other; or, preferably, there is a spacer layer 350 between the flexible display screen 310 and the support structure 320.

For example, the spacer layer 350 may be an air spacer layer, that is, there is an air gap between the flexible display screen 310 and the supporting structure 320.

For another example, the spacer layer 350 may be a foam layer or a metal layer, and the spacer layer 350 is provided with at least one through hole, so as to transmit optical signals through the at least one through hole. It is equivalent to providing through holes for transmitting optical signals on the foam layer or the metal layer.

When there is a small distance between the flexible display screen 310 and the supporting structure 320, the interference fringes caused by the deformation of the flexible display screen 310 will affect the fingerprint recognition performance of the optical fingerprint module 330, which is usually called "water ripple". When the distance between the flexible display screen 310 and the support structure 320 is too large, the flexible display screen 310 may be damaged by the finger pressing. Therefore, the spacer layer 350 between the flexible display screen 310 and the supporting structure 320 should have an appropriate thickness.

The embodiment of the present application does not limit the thickness of the spacer layer 350, for example, it may be 100-150 microns.

Since the optical fingerprint module 330 is fixed on the support structure 320, the size of the spacer layer 350 between the optical fingerprint module 330 and the flexible display 310 can be adjusted indirectly by adjusting the installation position of the support structure 320 in the vertical direction Therefore, while avoiding interference fringes caused by the deformation of the flexible display screen 310, the deformation space of the flexible display screen 310 is reduced.

Optionally, the fingerprint recognition device 300 further includes a buffer layer 360. Wherein, the buffer layer 360 is used to be arranged between the sexual display screen 310 and the supporting structure 320.

For example, the buffer layer 360 may be fixed on the lower surface of the flexible display screen 310, such as being pasted on the lower surface of the flexible display screen 310 by an adhesive layer.

At this time, the spacer layer 350 is located between the buffer layer 360 and the supporting structure 320.

For another example, the buffer layer 360 is fixed on the upper surface of the support structure 320, such as being pasted on the upper surface of the support structure 320 by a glue layer.

At this time, the spacer layer 350 is located between the buffer layer 360 and the flexible display 310.

For another example, two buffer layers 360 may be provided. One buffer layer 360 is fixed on the upper surface of the support structure 320, and the other buffer layer 360 is fixed on the lower surface of the flexible display screen 310.

At this time, the spacer layer 350 is located between the two buffer layers 360.

The above-mentioned adhesive layer may be, for example, an optically clear adhesive (OCA), a transparent glue, or a transparent adhesive film.

For another example, the upper surface of the buffer layer 360 is glued to the lower surface of the flexible display screen 310, and the lower surface of the buffer layer 360 is glued to the upper surface of the support structure 320, such as the upper surface of the protrusion of the boss structure.

At this time, there is no spacer layer 350 between the flexible display screen 310 and the supporting structure 320. Since the flexible display screen 310 and the supporting structure 320 are closely attached to the buffer layer 360 between the two, there is no small distance, and usually no interference fringes are generated.

The hardness of the buffer layer 360 should be in a suitable range to cushion the pressing force of the finger on the flexible display 310. Therefore, the buffer layer 360 can be made of transparent soft film materials such as plastic, silica gel, and glue film, such as polyurethane (Thermoplastic Polyurethanes, TPU), Polyimide (PI) or Polyethylene Terephthalate (PET) and other materials.

At this time, the buffer layer 360 can not only cushion the pressing force of the finger on the flexible display 310, but also indirectly adjust the gap between the support structure 320 and the flexible display 310 by adjusting the thickness of the buffer layer 360. 350 size. In addition, the buffer layer 330 fixed on the lower surface of the flexible display screen 310 also strengthens the flexible display screen 310 to a certain extent.

The buffer layer 360 may be one or more layers of transparent film materials.

That is, the buffer layer 360 can be a single material layer; it can also be a composite material layer, that is, composed of multiple material layers. For example, the buffer layer 360 includes an OCA adhesive layer, a PET layer, and an OCA adhesive layer from top to bottom.

The implementation of this application provides two implementation manners of the support structure 320.

In one implementation, the support structure 320 is a boss structure.

Optionally, the protrusion of the boss structure is located in the light-transmitting area under the flexible display screen 310.

Further, optionally, the protrusion is located below the foam layer 311 of the flexible display screen 310. For example, the edge of the protrusion and the foam layer 311 are connected by an adhesive material such as foam or glue layer.

Optionally, the non-protruding portion of the boss structure is located outside the light-transmitting area under the flexible display screen 310.

Further, optionally, the non-protruding part is located below the middle frame 340 or below the metal sheet 370. For example, the upper surface of the non-protruding portion is pasted to the lower surface of the middle frame 340 or the metal sheet 370 through an adhesive layer.

The above-mentioned glue layer may be, for example, foam, OCA, glue or film.

It can be understood that the convex part of the boss structure extends into the light-transmitting area under the flexible display screen 310, for example, is connected to the lower surface of the foam layer 311 that comes with the flexible display screen; and the non-convex part of the boss structure The raised portion is located outside the light-transmitting area, for example, is connected to the lower surface of the middle frame 340 or the metal sheet 370.

In the embodiment of the present application, since a light-transmitting area needs to be provided under the fingerprint detection area 312 in the flexible display 310 to facilitate the transmission of light signals for fingerprint recognition, the support structure 320 is filled in the light-transmitting area to The portion of the flexible display screen 310 in the fingerprint detection area 312 is supported, so that when a finger is pressed in the fingerprint detection area 312 for fingerprint recognition, the flexible display screen 310 will not be significantly deformed.

The supporting structure 320 in this implementation will be described below with reference to FIGS. 5 to 9.

FIG. 5 shows the flexible display screen 310, the supporting structure 320, the buffer layer 360, the metal sheet 370, the middle frame 340 and the optical fingerprint module 330. Wherein, the buffer layer 360 is a transparent soft film material, which is fixed on the lower surface of the flexible display screen 310. A metal sheet 370 is pasted under the foam layer 311 of the flexible display screen 310. The metal sheet 370 and the middle frame 340 are connected by a foam 341, where the foam 341 functions as a connection and buffer, and it can also be replaced with glue, film and other adhesive materials.

The support structure 320 is a boss structure, the boss of the boss structure is upward, the boss extends into the light-transmitting area under the flexible display 310, and the non-protruding part of the boss structure is located in the light-transmitting area outer. Specifically, the raised portion of the boss structure is located below the foam layer 311, and the edge of the raised portion is fixed to the edge of the light-transmitting window of the foam layer 311 through the foam 321, wherein the foam layer 311 is flexible The foam layer that comes with the display 310. The non-protruding part of the boss structure is located under the middle frame 340, and the non-protruding part is fixed to the edge of the light-transmitting window of the middle frame 340 by an adhesive layer 321, wherein the adhesive layer 321 may be an adhesive film or glue, etc. Paste the material.

The boss structure is snapped into the light-transmitting area under the flexible display 310. In addition, there is a spacer layer 350 between the upper surface of the raised portion of the boss structure and the buffer layer 360. Among them, the thickness of the spacer layer 350 can be adjusted indirectly by adjusting the thickness of the adhesive layer 321 and/or the buffer layer 360, so as to find the best imaging position of the optical fingerprint module 330 so that the optical fingerprint fixed on the lower surface of the boss structure The fingerprint module 330 achieves an optimal fingerprint recognition effect.

Moreover, since the vertical position of the boss structure can be adjusted by adjusting the thickness of the adhesive layer 321, the processing and installation errors of the various laminates such as the middle frame 340 and the metal sheet 370 can be absorbed.

In addition, it can be seen from FIG. 5 that the supporting structure 320 decouples the optical fingerprint module 330 and the flexible display 310, and can replace the optical fingerprint module 330 without damaging the flexible display 310. And maintenance.

6 shows the various components of the fingerprint recognition device in FIG. 5, in which adhesive is present in the opening area on the lower surface of the flexible display screen 310, and the opening area is the foam layer 311 and The opening area formed by the light-transmitting window of the metal sheet 370 or the like, and the adhesive is used to stick the buffer layer 360. The buffer layer 360 is pasted on the inner area of the opening through the adhesive. The middle frame 340 is fixed on the lower surface of the flexible display screen 310, and the position of the light-transmitting window of the middle frame 340 is the same as the position of the opening area on the lower surface of the flexible display screen 310. The transparent boss structure 320 is buckled into the transparent window of the middle frame 340. The optical fingerprint module 330 is fixed on the lower surface of the middle frame.

FIG. 7 shows the flexible display screen 310, the supporting structure 320, the metal sheet 370, the middle frame 340 and the optical fingerprint module 330. Compared with FIG. 5 and FIG. 6, the buffer layer 360 is not provided in FIG. 7. Wherein, a metal sheet 370 is pasted under the foam layer 311 of the flexible display screen 310. The metal sheet 370 and the middle frame 340 are connected by a foam 341, where the foam 341 functions as a connection and buffer, and it can also be replaced with glue, film and other adhesive materials.

The supporting structure 320 is a boss structure. The protruding part of the boss structure is upward, the protruding part extends into the light-transmitting area under the flexible display screen 310, and the non-protruding part of the boss structure is located outside the light-transmitting area. Specifically, the edge of the raised portion of the boss structure is connected to the lower surface of the flexible display screen 310 through a foam 321, where the foam 321 functions as a connection and buffer. The non-protruding part of the boss structure is located under the middle frame 340, and the non-protruding part is fixed to the edge of the light-transmitting window of the middle frame 340 by an adhesive layer 321, wherein the adhesive layer 321 may be an adhesive film or glue, etc. Paste the material.

The boss structure is snapped into the light-transmitting area under the flexible display 310. In addition, there is a spacer layer 350 between the upper surface of the raised portion of the boss structure and the flexible display screen 310. Among them, the thickness of the spacer layer 350 can be adjusted indirectly by adjusting the thickness of the adhesive layer 321, so as to find the best imaging position of the optical fingerprint module 330, so that the optical fingerprint module 330 fixed on the lower surface of the boss structure is optimized Fingerprint recognition effect.

In addition, it can be seen from FIG. 7 that the supporting structure 320 decouples the optical fingerprint module 330 from the flexible display 310, and can replace the optical fingerprint module 330 without damaging the flexible display 310. And maintenance.

The spacer layer 350 shown in FIGS. 5 and 7 is an air spacer layer. However, the embodiment of the present application is not limited to this, and the spacer layer 350 capable of realizing optical signal transmission should fall within the protection scope of the present application.

For example, the spacer layer 350 in FIG. 6 can be replaced with the spacer layer 350 shown in FIG. 8(a). Wherein, in FIG. 8(a), the supporting structure 320 is a boss structure, and the protrusion is upward. A plurality of through holes are provided on the spacer layer 350 located above the boss structure, and these through holes can be used to transmit optical signals. Therefore, the spacer layer 350 can not only keep a proper distance between the optical fingerprint module 330 and the flexible display 310 to meet the imaging requirements of the optical fingerprint module 330, but also ensure the reflection or scattering of the finger above the flexible display 310 The optical signal can be smoothly transmitted to the optical fingerprint module 330 through these through holes.

The embodiment of the present application does not limit the shape and position of the through holes on the spacer layer 350. For example, the top views of the spacer layer 350 shown in FIG. 8(b) and FIG. 8(c), taking 4 through holes as an example, The 4 through holes can be arranged side by side or evenly arranged in two vertical directions.

When the spacer layer 350 adopts this design, it is particularly suitable for the case where the optical fingerprint module 330 uses multiple optical fingerprint sensors to splice. Because when multiple optical fingerprint sensors are spliced together, the area of the fingerprint detection area of the optical fingerprint module 330 will increase, and the lateral area of the light-transmitting area under the flexible display 310 will also increase. The non-through hole area of the spacer layer 350 can support the flexible display screen 310 in the large fingerprint collection area.

For example, replacing the spacer layer 350 shown in FIG. 5 with a spacer layer 350 with through holes, to obtain a fingerprint recognition device as shown in FIG. 9.

Furthermore, the buffer layer 360 shown in FIG. 9 can also be removed to obtain the fingerprint recognition device shown in FIG. 10.

For the detailed description of each component in FIG. 9 and FIG. 10, reference may be made to the aforementioned related description for FIG.

The boss structure can be a single body, for example, the boss structure is made of a transparent material integrally molded; the boss structure can also be a component, that is, the boss structure is formed by combining different materials, for example, the boss of the boss structure The portion and the non-protruding portion may be made of different materials.

When the boss structure is formed by a combination of different materials, optionally, the convex part of the boss structure is formed of cured glue, and the non-convex part of the boss structure is a transparent flat plate pasted under the convex part .

For example, the protrusions are formed by filling the glue before curing into the light-transmitting window of the metal sheet 370 and curing it.

The glue can be, for example, a curing glue, such as a thermosetting glue or an ultraviolet curing (Ultraviolet, UV) glue.

Among them, the transparent flat plate can be made of, for example, transparent glass or transparent resin.

The above-mentioned boss structure formed of different materials can be manufactured by the method shown in FIG. 11, for example.

Fig. 11 is a schematic flow chart of a manufacturing method of a supporting structure, wherein the supporting structure is the aforementioned boss structure. As shown in FIG. 11, the method 1100 includes:

In 1110, the metal sheet 370 is placed horizontally on one side of the auxiliary flat plate 380, wherein the auxiliary flat plate 380 covers the light transmission window of the metal sheet 370.

In 1120, glue 322 in a liquid state is spotted on the part of the auxiliary plate 380 located in the light-transmitting window.

In 1130, the transparent plate 323 is covered on the light-transmitting window from the other side of the auxiliary plate 380, so that the glue 322 in a liquid state fills the light-transmitting window.

In 1140, the glue 322 in the liquid state is cured to obtain the boss structure.

Wherein, the convex part of the boss structure is cured glue 322, and the non-convex part of the boss structure is a transparent flat plate 323.

Hereinafter, a detailed description will be given by taking FIGS. 12 and 13 as examples.

FIG. 12 shows a top view of the metal sheet 370. A light-transmitting window is provided on the metal sheet, and the light-transmitting window is located in the light-transmitting area under the flexible display screen 310 and is used to transmit light signals for fingerprint recognition. The light-transmitting window can be of any shape. In FIG. 12, the light-transmitting window of the metal sheet is square as an example.

FIG. 13 shows the metal sheet 370, the auxiliary plate 380, the glue 322 currently in a liquid state, and the transparent plate 323. Among them, the glue 322 is used to form the protrusions of the boss structure, and the transparent flat plate 323 is used as the non-protrusions of the boss structure. The auxiliary plate 380 may be, for example, a non-adhesive plate or film, such as a glass plate with silicone oil.

First, the auxiliary flat plate 380 is placed on one side of the metal sheet 370 and covers the light transmission window of the metal sheet 370.

Secondly, the glue is dispensed in the light-transmitting window of the metal sheet 370, that is, the glue 322 is spotted on the position of the auxiliary plate 380 in the light-transmitting window. The dispensing amount of the glue 322 should be such that the glue 322 can at least fill the light-transmitting window.

Finally, the transparent flat plate 323 is covered on the light-transmitting window from the other side of the metal sheet 370, so that the glue 322 naturally fills the light-transmitting window of the metal sheet 370 and the space between the metal sheet 370 and the transparent flat 323. gap.

The glue 322 is cured, and the auxiliary plate 380 is removed, so as to obtain the boss structure embedded in the light-transmitting window of the metal sheet 370 as shown in FIG. 14, for example. The glue between the transparent flat plate 323 and the metal sheet 370 is very thin, which is not shown here.

It should be understood that in order to form the boss structure more conveniently, the auxiliary plate 380 shown in FIG. 13 is usually placed at the bottom layer, the metal sheet 370 is placed above the auxiliary plate 380, and the glue 322 is clicked into the auxiliary plate 380 from above. In the window area formed with the metal sheet 370, the transparent flat plate 323 is covered on the light-transmitting window of the metal sheet 370 from top to bottom, so that the glue 322 fills the light-transmitting window.

In addition, the connection between the transparent plate 323 and the raised portion, that is, the cured glue 322, can also be realized by transparent glue or a transparent glue film such as OCA.

The thickness of the protrusion of the boss structure is the same as the thickness of the metal sheet 370.

Optionally, the height of the upper surface of the raised portion of the boss structure and the upper surface of the metal sheet 370 are the same.

Optionally, the protrusions and the upper surface of the metal sheet 370 are covered with an overflow glue layer 3221 formed by the glue 322 before curing overflowing the transparent window of the metal sheet 370.

The thickness of the overflow adhesive layer 3221 is small and can reach the micron level. In other words, the raised portion of the boss structure, that is, the upper surface of the cured glue 322, and the upper surface of the metal sheet 370, can receive a small amount of glue overflow. Therefore, it is ensured that there is no step difference between the overflow adhesive layer 3221 and the metal sheet 370. Due to the small thickness, the overflow adhesive layer 3221 is not shown in FIG. 14.

As shown in FIG. 15, the overflow adhesive layer 3221 may have an irregular shape.

It can be understood that the overflow glue layer 3221 realizes the transition from the upper surface of the convex portion of the boss structure to the upper surface of the metal sheet 370, so the step difference between the boss structure and the metal sheet 370 can be further eliminated, and the The user experiences and protects the flexible display 310.

In addition, the step difference between the overflow glue layer 3221 and the metal sheet 370 can also be reduced or eliminated by grinding and polishing, which is not limited here.

Based on the boss structures of Figs. 12 to 15, Figs. 16 and 17 show a fingerprint recognition device using the boss structure.

As shown in FIG. 16, the flexible display screen 310, the supporting structure 320, the metal sheet 370 and the optical fingerprint module 330 are shown. Wherein, the lower surface of the flexible display screen 310 is provided with a transparent film 313. The transparent film 313 may be, for example, an OCA glue layer or a composite layer such as an OCA glue layer, a PET layer, and an OCA glue layer. The metal sheet 370 is fixed on the lower surface of the transparent film 313. The support structure 320 includes a raised portion embedded in the light-transmitting window of the metal sheet 370, that is, cured glue 322, and a non-protruding portion, that is, a transparent flat plate 323 located under the metal sheet 370. The optical fingerprint module 330 is pasted on the lower surface of the transparent flat plate 323.

As shown in FIG. 17 again, a flexible display screen 310, a supporting structure 320, a buffer layer 360, a metal sheet 370 and an optical fingerprint module 330 are shown. Wherein, the lower surface of the flexible display screen 310 is provided with a foam layer 311, and the metal sheet 370 is fixed on the lower surface of the foam layer 311. The support structure 320 includes a raised portion embedded in the light-transmitting window of the metal sheet 370, that is, cured glue 322, and a non-protruding portion, that is, a transparent flat plate 323 located under the metal sheet 370. The upper surface of the buffer layer 360 is pasted on the lower surface of the flexible display screen 310, and the lower surface is bonded to the upper surface of the protrusion of the boss structure. The optical fingerprint module 330 is pasted on the lower surface of the transparent flat plate 323.

For the detailed description of the boss structure in FIGS. 16 and 17, reference may be made to the description of FIGS. 12 to 15, which is not repeated here for brevity.

In another implementation manner of the support structure 320, a plurality of through holes are provided on the support structure 320, and the plurality of through holes are used to transmit optical signals.

For example, the support structure 320 may be a support layer provided with multiple through holes, such as a foam layer or a metal layer provided with multiple through holes.

As shown in FIG. 18, a flexible display screen 310, a supporting structure 320, a buffer layer 360, a metal sheet 370, a middle frame 340 and an optical fingerprint module 330 are shown. A metal sheet 370 is pasted under the foam layer 311 of the flexible display screen 310. The metal sheet 370 and the middle frame 340 are connected by a foam 341, where the foam 341 functions as a connection and buffer, and it can also be replaced with glue, film and other adhesive materials. The buffer layer 360 is a transparent soft film material, which is fixed on the lower surface of the flexible display screen 310. The supporting structure 320 is fixed on the lower surface of the buffer layer 360.

The support structure 320 is a support layer provided with a plurality of through holes, and the plurality of through holes are used to transmit light signals reflected from a finger above the flexible display 310. The support structure 320 is located in the light-transmitting area under the flexible display screen 310, specifically, in the light-transmitting window of the middle frame 340. The optical fingerprint module 330 is fixed on the lower surface of the supporting structure 320.

Of course, the support structure 320 shown in FIG. 18 can also be replaced with a transparent material layer, so as to transmit real image light signals without perforating the support structure 320.

In the embodiment of the present application, the support structure 320 is provided in the light-transmitting area under the flexible display screen 310, so that the support structure 320 can provide a supporting effect for the flexible display screen 310, and reduce the risk of fingers pressing the flexible display screen during the fingerprint recognition process. Deformation to avoid damage to the flexible display. Moreover, since the optical fingerprint module 330 is disposed on the supporting structure 320, the distance between the optical fingerprint module 330 and the flexible display 310 can be flexibly adjusted through the supporting structure 320, thereby improving the performance of fingerprint recognition. In addition, since the optical fingerprint module 330 and the flexible display screen 310 have been decoupled, it is convenient to disassemble and install the optical fingerprint module 330 and facilitate the maintenance of the optical fingerprint module 330.

In the embodiments of the present application, each paste material located in the light-transmitting area should be a transparent paste material so as not to affect the transmission of optical signals. For example, the buffer layer 360 can be pasted on the lower surface of the flexible display 310 with OCA glue; and The various adhesive materials located on the non-optical path may preferably be other non-transparent adhesive materials to achieve absorption of stray light. For example, the upper surface of the non-protruding portion of the boss structure 320 is made of foam, glue or glue. The film is stuck on the surface of the middle frame 340. Not all pasting materials are shown in FIGS. 4 to 18.

An embodiment of the present application also provides an electronic device, which includes a flexible display screen and the fingerprint recognition device in the various embodiments of the present application described above.

Optionally, the electronic device further includes a middle frame.

Optionally, a metal sheet is provided between the flexible display screen and the middle frame.

As an example and not a limitation, the electronic devices in the embodiments of the present application may be portable or mobile computing devices such as terminal devices, mobile phones, tablet computers, notebook computers, desktop computers, game devices, in-vehicle electronic devices, or wearable smart devices, and Electronic databases, automobiles, bank automated teller machines (Automated Teller Machine, ATM) and other electronic equipment. The wearable smart device includes full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones Use, such as various types of smart bracelets, smart jewelry and other equipment for physical sign monitoring.

It should be noted that, under the premise of no conflict, the various embodiments described in this application and/or the technical features in each embodiment can be combined with each other arbitrarily, and the technical solutions obtained after the combination should also fall within the protection scope of this application. .

It should be understood that the specific examples in the embodiments of the present application are only to help those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application. Those skilled in the art can base on the above-mentioned embodiments. Various improvements and modifications are made, and these improvements or modifications fall within the scope of protection of the present application.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A fingerprint recognition device, characterized in that it is applied to an electronic device with a flexible display screen, and the device includes:

A supporting structure, configured to be at least partially disposed in a light-transmitting area below the flexible display screen, and the supporting structure is used to support the flexible display screen;

The optical fingerprint module is used to be arranged on the supporting structure, and the optical fingerprint module is used to collect the light signal reflected or scattered by the finger above the flexible display screen and transmitted from the light-transmitting area.
The device according to claim 1, wherein the supporting structure is a boss structure, and the boss of the boss structure is located in the light-transmitting area.
The device according to claim 2, wherein the protrusion is located below the foam layer of the flexible display screen.
The device according to claim 3, wherein the edge of the protrusion and the foam layer of the flexible display screen are connected by foam or glue film.
The device according to any one of claims 2 to 4, wherein the non-protruding part of the boss structure is located below the middle frame of the electronic device.
The device according to claim 5, wherein the upper surface of the non-protruding portion is pasted to the lower surface of the middle frame by glue or film.
The device according to any one of claims 2 to 4, wherein a metal sheet is provided under the flexible display screen, and a light-transmitting window is provided on the metal sheet, and the light-transmitting window is located at the The light transmission area,

Wherein, the non-protruding part is located below the metal sheet.
8. The device according to claim 7, wherein the upper surface of the non-protruding portion is pasted to the lower surface of the metal sheet by glue or film.
The device according to claim 7 or 8, wherein the protrusion is formed of cured glue, and the non-protruding part is a transparent flat plate pasted under the protrusion.
9. The device according to claim 9, wherein the protrusion is formed by filling the glue before curing into the transparent window of the metal sheet and curing it.
The device according to any one of claims 9 to 11, wherein the height of the upper surface of the protrusion is the same as the height of the upper surface of the metal sheet.
The device according to any one of claims 9 to 11, wherein the convex portion and the upper surface of the metal sheet are covered with the transparent light of the glue overflowing the metal sheet before curing. The overflow glue layer formed by the window.
The device according to any one of claims 9 to 12, wherein the glue is thermosetting glue or ultraviolet curing UV glue.
The device according to any one of claims 7 to 13, wherein the middle frame of the electronic device is arranged below the metal sheet.
The device according to any one of claims 2 to 8, wherein the boss structure is integrally made of a transparent material.
The device according to claim 15, wherein the transparent material is transparent glass or resin.
The device according to any one of claims 1 to 16, wherein there is a spacer layer between the flexible display screen and the supporting structure.
The device according to claim 17, wherein the spacer layer is an air spacer layer.
The device according to claim 17, wherein at least one through hole is provided on the spacer layer, and the at least one through hole is used to transmit the optical signal.
The device according to claim 19, wherein the spacer layer is a foam layer or a metal layer.
The device according to claim 1, wherein the supporting structure is provided with a plurality of through holes, and the plurality of through holes are used to transmit the optical signal.
The device according to claim 21, wherein the supporting structure is a foam layer or a metal layer.
The device according to any one of claims 1-22, wherein the device further comprises:

The buffer layer is used to be arranged between the flexible display screen and the supporting structure.
The device according to claim 23, wherein the buffer layer is fixed on the lower surface of the flexible display screen.
The device of claim 24, wherein the spacer layer is located between the buffer layer and the support structure.
The device according to claim 23, wherein the buffer layer is fixed on the upper surface of the supporting structure.
The device of claim 26, wherein the spacer layer is located between the buffer layer and the flexible display screen.
The device according to claim 23, wherein the upper surface of the buffer layer is pasted on the lower surface of the flexible display screen, and the lower surface of the buffer layer is pasted on the convex part of the boss structure. Upper surface.
The device according to any one of claims 23 to 28, wherein the buffer layer comprises one or more transparent film materials.
The device according to any one of claims 1 to 29, wherein the optical fingerprint module is fixed on the lower surface of the supporting structure.
An electronic device, characterized in that, the electronic device includes:

Flexible display; and,

The fingerprint recognition device according to any one of claims 1 to 30.
The electronic device according to claim 31, wherein the electronic device further comprises a middle frame.
The electronic device according to claim 32, wherein a metal sheet is provided between the flexible display screen and the middle frame.
A manufacturing method of a support structure, characterized in that the support structure is used to support a flexible display screen of an electronic device, the support structure is a boss structure, and the method includes:

Placing the metal sheet used for setting under the flexible display screen horizontally on one side of the auxiliary flat plate, wherein the auxiliary flat plate covers the light-transmitting window of the metal sheet;

Pour liquid glue into the part of the auxiliary plate located in the light-transmitting window;

Covering the transparent flat plate onto the light-transmitting window from the other side of the auxiliary flat plate, so that the glue in a liquid state fills the light-transmitting window;

The glue in the liquid state is cured to obtain the boss structure, wherein the convex part of the boss structure is the glue after curing, and the non-convex part of the boss structure is the transparent flat.
The method according to claim 34, wherein the height of the upper surface of the protrusion is the same as the height of the upper surface of the metal sheet.
The method according to claim 34 or 35, characterized in that the protrusions and the upper surface of the metal sheet are covered with a light-transmitting window formed by the glue overflowing the metal sheet before curing. Overflow adhesive layer.
The method according to any one of claims 34 to 36, wherein the glue is thermosetting glue or ultraviolet curing UV glue.
The method according to any one of claims 34 to 37, wherein the transparent plate is made of transparent glass or transparent resin.